# P4

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How do you find the speed of an object?
Speed= Distance travelled/time taken
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How do speed cameras work?
Use painted lines on the road to measure the distance travelled by a vehicle in a set time
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Speed
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What does Gradient tell you in a distance-time graph?
The velocity
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What does displacement mean?
When distance is given with a particular indication of direction.
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What does Instantaneous velocity mean?
The speed and direction at a given moment of time
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What does Velocity describe?
Both speed and direction
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What does Acceleration mean?
The change in velocity in a certain amount of time
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How do you work out Acceleration?
Acceleration= Change in velocity/ Time taken
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What does the gradient show in a velocity-time graph?
Acceleration
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What is partner forces/ Interaction pair?
When one object forces on another subject, it always experiences a force in return
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What is a reaction force?
An equal and opposite force upwards
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What does friction move?
When an object is moving relative to another one, both objects experience a force in the direction that opposes the movement
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Is friction a reaction force?
Yes- It happens in a result of an applied force
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What are the three types of friction?
Friction between solid surfaces which are gripping- friction between feet and ground allows you to push against it and move fowards
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## Other cards in this set

### Card 2

#### Front

How do speed cameras work?

#### Back

Use painted lines on the road to measure the distance travelled by a vehicle in a set time

### Card 4

#### Front

What does Gradient tell you in a distance-time graph?

### Card 5

#### Front

What does displacement mean?